Emma’s first time using the device was aired in a BBC documentary series called The Big Fix. When she puts her pen to the paper without any shaking, she can’t help but burst into tears.

Though there is currently no cure for Parkinson’s disease, the Emma Watch is a huge breakthrough for dealing with its symptoms.

“I’m trying to figure out a way to move this forward, because I’ve got hundreds of messages from people who want the device for themselves or their family members,” Zhang told Microsoft. “That’s all the messages I get. I have close to 100 in my inbox, and then people contact me on Instagram, Twitter, on LinkedIn, on my blog, it’s just every whichway.”